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Abstract

A prestressed fiber Bragg grating with high temperature stability has
been successfully fabricated by use of 800 nm femtosecond laser pulse irradiation
through high-temperature annealing, followed by a rapid cooling treatment.
The reflectivity and the resonant wavelength of the grating are maintained
constants for more than 26 h in an isothermal measurement up to 1200 $^{\circ}$C, showing
significant improvement over conventional femtosecond laser pulse induced
fiber gratings. Longitudinal tension tests demonstrate that the prestressed
fiber exhibits enhanced mechanical robustness compared with the residual stress
relaxed fiber. This paper reveals that residual stress plays an important
role and essentially provides a new solution to enhance the thermal stability
of fiber gratings at elevated temperatures and offering high reliability.

References

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